Looks like I'm about 5 year late to this conversation but I just received a Longines Hydroconquest, the USA edition, as a gift.
I'm not trying to look a gift horse in the mouth, but it was purchased new off of Amazon for a few hundred below retail. It came in a beautiful box with all the paperwork and It looks damn good. The only thing that makes me question it's authenticity is the fact that, although the luminescence seems to get very bright when exposed to actual sunlight, when exposed to artificial light it stays pretty dim. My $250 Seiko diver stays brighter all night than this beautiful time piece.